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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
The diaphragm forms the base of the thorax. Contractions of the diaphragm and the intercostals muscle change the size of the thorax and, thus, cause air to move in and out of the lungs. The main job of the respiratory system is to get oxygen into the body and get waste gases out of the body.his helps to keep the air entering the nose from drying out the lungs and other parts of our respiratory system. When air enters the respiratory system through the mouth, much less filtering is done. It is generally better to take in air through the nose.